The most poetic and the most prestigious watch-making complication is on your IPhone.

Besides to ring automatically at the hours and quarters of an hour it allows, on request, to listen to the exact time at any moment.
Invented in 1750 by T. Mudge, it is very difficult to incorporate into a mechanical watch, because requiring up to 100 different components.\Its first purpose was to "ring" the hour in the dark ; And by extension allow the visually handicapped people "to hear" the time.

Today only the most prestigious manufacturers still make these watches (Plan around 200 000 Euros).